Geely Diagnosis Flow. Manual part — 74

293

No. 212 Large loudspeaker noise

Malfunction Cause

Solution

Dirts in loudspeaker magnet
clearance or cone diaphragm
cracked.

Check loudspeaker magnet clearance and cone

①

diaphragm,

whether there is dirt in the clearance or the diaphragm cracked. With
that problems voice will be distortion when voice coil vibrating, and
results raucity voice.

Loudspeaker circuit poor contact

C

②

heck loudspeaker circuit, whether it is damaged or short circuit

to earth, as well as virtual connection between circuit and
CD-player/loudspeaker. Maintain or replace it when necessary.

Pull out the pins of CD

③

-player and loudspeaker, measure the

resistance by multimeter, the value between both ends of circuit
shall be 0 Ohm, the resistance to earth shall be infinite, and the
resistance of loudspeaker shall be 4 Ohm. Inspect or replace when
necessary.

External appliances affection

Check the appliances i

④

n engine cabin, high voltage wire for

example, mainly inspect the electromagnetic frequency, generated
when the appliances operating, which may affect the normal
operation of CD-player and loudspeaker.

CD –player stabilized voltage supply
components malfunction

Check the filter of CD

⑤

-player stabilized voltage, some may equips

with inductive choke filter, then shall check current leakage in
inductive choke. Replace CD-player when necessary.

Check capacitor of circuit, whether it is damaged. Remove the

⑥
capacitor and measure it by multimeter setting at voltage range,
survey value variation between straight polarity and reverse polarity.
If the variation range is too narrow, which indicates the capacitor is
damaged, then replace CD-player.

CD –player voice circuit short or
damaged

Most malfunctions

⑦

in voice circuit appear on capacitor, cause

current leakage or sealing-off always affect voice affection when
playing, with load noise. Measure it by multimeter, replace
CD-player or implement welding when necessary.

Large

loudspeaker

noise

CD –player power amplifying circuit
short or damaged

Check power

⑧

amplifying circuit, measure the voltage between

each pin by multimeter, survey the signal from front amplifying
circuit, mainly inspect the capacitor, resistance, circuit and
integrated package on circuit panel, whether there are evidences of
burning. Replace CD-player when necessary.

294

Replace CD-player assembly

CD –player power
amplifiying circuit short or
damaged

CD –player voice short

circuit or damaged

CD –player stabilized voltage supply

components malfuction

External appliances affection

Loudspeaker circuit poor

contact

Dirts in loudspeaker magnet

clearance or cone diaphragm

cracked.

Large loudspeaker noise

Replace loudspeaker

Maintain loudspeaker circuit

Maintain modify replace

Replace CD-player

Replace CD-player

Replace CD-player

Normal

Abnormal

Abnormal

Abnormal

Abnormal

Abnormal

Abnormal

Normal

Normal

Normal

Normal

Normal

295

No. 213 Loudspeaker susurrates when pressing horn

Malfunction Cause

Solution

Loudspeaker damaged or screws loose

Check whether loudspeaker cone diaphragm is cracked.

①
Check whether the loudspeaker retaining screws are loose.
Since the vehicle horn mounting at front cross member, body
will be vibrated when pressing horn, meanwhile, cracked
diaphragm or loose screws will result CD-player loudspeaker
voice distortion, as well as voice raucity when pressing horn.
Solution: replace horn and tighten loudspeaker retaining screw.

Loudspeaker short circuit

Check loudspeaker circuit, whether it is damaged or short

②
circuit to earth, as well as short circuit between loudspeaker
circuit and horn circuit. Measure the resistance between
loudspeaker and earth, whether it is under normal range.
Maintain or replace it when necessary.

The screw of CD-player and horn earthlead
loose

Check the screws of CD

③

-player earth lead, horn earth lead

and body connecting position, whether they are loose. When
pressing horn, earth lead will be virtually conducted, because
screws loose, the friction between body and earth lead will
cause weak spark and generates interfering signal, which
results loudspeaker raucity. Solution: Clean earth leads, and
tighten the retaining screws.

CD-player short circuit

Check the resistance between terminal A3, at CD

④

-player pin,

and body. Disconnect CD-player pin and rear view mirror pin,
measure the resistance from A3 terminal to fuse by multimeter,
the value shall be infinite, that is under non-conduction.
Otherwise, shall maintain CD-player power supply circuit.

When pressing horn, loudspeaker susurrates, then

⑤

shall

mainly inspect short circuit between horn circuit, earth lead
connecting with CD-player earth lead, and CD-player circuit.
Maintain circuit when necessary.

Loudspeaker

susurrates when

pressing horn

CD-player inner magnet interference may
result loudspeaker noise

Check CD

⑥

-player power supply circuit and inner stabilitized

power supply, whether there is burnt or short circuit. Mainly
inspect the capacitor between power supply and circuit,
whether there is current leakage or damage. Maintain or
replace it when necessary.

Check anti

⑦

-interference or wireharness direction on

CD-player. As well as screen condition of CD-player, whether it
is interfered by screen wire damage. Maintain or replace it
when necessary.

Check CD

⑧

-player high frequency receiving circuit, whether

there is damaged component, short circuit in circuit, or current
leakage in high frequency capacitor. Maintain circuit or replace
CD-player assembly when necessary.

296

Replace loudspeaker

Loudspeaker damage or screws

loose

Loudspeaker susurrates

when pressing horn

Loudspeaker short circuit

The screw of CD-player and horn

earthlead loose

Horn and CD-player short circuit

CD-player inner short circuit or burnt

Replace CD-player assembly

Maintain and replace CD-player

Maintain and replace

Maintain and tighten

Maintain, tighten and replace

Abnormal

Abnormal

Abnormal

Abnormal

Abnormal

Normal

Normal

Normal

Normal

Normal